As I mentioned in the
previous thread, You are still using the version 1.1 configuration.

Enterprise Library configuration had a major change between version 1 and version 2 so you will need to migrate the configuration. I would recommend reading the
Enterprise Library 5.0 Developers Guide especially chapter 2 on Data Access and Appendix D on configuration.

Since you are already explicitly reading in configuration I would recommend loading the dataConfiguration.config directly: